Help!!! I need to put a Helicoil in my rear head exhaust stud - 3000GT/Stealth International Message Center
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Old 07-12-2019, 11:47 PM   #1 (permalink)
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Default Help!!! I need to put a Helicoil in my rear head exhaust stud

Hi, I recently replaced my heads with used heads that I had serviced at my local machine shop. I put my car all back together Genuine oem mls head gaskets, head bolts, timing components, like I said I did everything right. Car runs perfectly, doesnít overheat or have any coolant leaking past the gaskets. I did a perfect job with the exception of one small problem.

The rear far left lower exhaust manifold stud hole threads wonít hold anything at all. Even tried taking everything off and cleaning it and replacing with a new exhaust gasket and it still has a leak from that one port that is big enough to cause me to run lean on my wideband.

So my question to my wonderful 3/S family is what size helicoil kit do I buy? What size drill bit and what size tap please? Iím 100% sure that I have everything clearance to fix this without removing the head again. And I would really rather not ever have to break that head gasket seal again. So if anyone can drop some knowledge on me please feel free to. I need the sizes of everything please.

Thank you for reading and have a safe weekend
J
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Old 07-13-2019, 12:06 AM   #2 (permalink)
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Default Re: Help!!! I need to put a Helicoil in my rear head exhaust stud

They are 10mm by 1.25 as far as I know. The helicoils say what drill bit to use.
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Old 07-13-2019, 12:09 AM   #3 (permalink)
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Default Re: Help!!! I need to put a Helicoil in my rear head exhaust stud

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Originally Posted by Chris @ Rvenge Performance View Post
They are 10mm by 1.25 as far as I know. The helicoils say what drill bit to use.
Thank you so much for your help my brother!!!
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Old 07-13-2019, 01:52 AM   #4 (permalink)
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Default Re: Help!!! I need to put a Helicoil in my rear head exhaust stud

I like to buy the kits that include the appropriate drill bit for two reasons: A new drill will be properly sharp and I don't have to go searching for the correct size as I already have it. Without fail the one I need is always the one I can't find.

For reference you can always google "tap and die chart" to see which drill size you need for the tap in the kit. I always do that even when the kit has a drill bit but I'm paranoid.
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Old 07-13-2019, 01:55 AM   #5 (permalink)
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Default Re: Help!!! I need to put a Helicoil in my rear head exhaust stud

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Originally Posted by PhailosaurusRex View Post
I like to buy the kits that include the appropriate drill bit for two reasons: A new drill will be properly sharp and I don't have to go searching for the correct size as I already have it. Without fail the one I need is always the one I can't find.

For reference you can always google "tap and die chart" to see which drill size you need for the tap in the kit. I always do that even when the kit has a drill bit but I'm paranoid.
Thanks +1 rep for you
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